This screw down DC adaptor will allow you to run twin-cable DC power to your existing DC-tip 2.1mm power input. The Maplin Female DC to Twin Cable to 5.5 x 2.1mm DC Power Plug is a simple to use, screw down twin-cable adaptor used for allowing twin-cable DC power to be used with existing CCTV cameras that may use the common 2.1mm DC connector input. Simply screw down the cables directly to the mount posts and your ready to feed DC power to your device, including that of other common DC-only devices. With a power range of 12V-36V DC and an approximate overall diameter of 5.5 x 2.1mm, it features high-conductivity metal with a robust, plastic outer construction.